Warp-let-off mechanism for looms.



No. 728,001. PATENTBD M1112, 1903. y 1 J. M. BECKHAM.

-WARP LET-0111'A MBCHANISM F011 Looms;

APPLHJATION FILED AUG. 2'3. 1902.

No HODEL. q

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ilm'rnn STATES' Patented May 12, 1903.

PATENT Ormes.

JAMES M. PECKHAM, OF FALL RIVER, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO RICHARD THACKERAY, OF FALL RIVER, MASSACHUSETTS.

WARP-LET-OFF MECHANISM FOR LOOMS.

sPEcr'FIcATIoN forming part of Lettere Patent Ne. 728,001, dated Mey 12, l1903.

Application filed August 23, 1902. Serial No. 120|835. (No model.)

To all whom i may concern.-

Be it known that I, JAMES M. PnoKHAM, a citizen of the United States, residing at Fall River, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in Warp-Let-O Mechanism for Looms, of which the following isa specification.

In a loom the Warp Wound on a warp-beam is let off and held under the required. tension. At the opening of the warp-shed for the passage of the shuttle to lay the weft the warp is sprung above and below the normal plane of the warp.A Extra strain is suddenly exerted on the warp on the opening of each shed, and this strain is released at the closing of each shed, at which the warp returns to the normal plane. In` the usual positive let-off motions the Warp-threads'are subjected to considerable strain, and the Warp-threads are liable to stretch and produce imperfectcloth. In friction let-0E motions the friction-brakes are usually weighted by placing Weights on the brake-straps or by adjustably securing weights to levers connected with the frictionbrakes. The securing or adjusting of these Weights, which are usually detached parts, requires time and considerable experience.

The object of this invention is to construct a cheap and simple let-off mechanism which has no disconnected parts and which permits the warp-beam to rock on its bearings, so as to yield to the extrastrain in forming the shed and automatically recovers the slack caused by the closing of the shed.

To this end the invention consists in the peculiar and novel construction of the brakestrap and the adjustable spring tension, as will be more fully set forth hereinafter.

Figure lis a rear elevation of part of a loom,showing theWarp-beam and my iniproved let-off mechanism. Fig. 2 isa transverse sectional View of `the let-off motion, on an enlarged scale, indicating in broken lines the position of the mechanism when the slack in the warp is taken up. Fig. 3 is a sectional view of the device for adjusting the spring tension on the brake, and Fig. 4 is a sectional View of the spring clamping device.

In the drawings, a ot indicate the end frames of the loom; a', the back strut connecting the end frames; a2, the warp-beam; 0.3 as, the

cured by bending back the end ofthe strap b and securing the lap by a rivet. I cut the strap b to the required length, bend back the end, insert the loop b2, and fasten the lap by a rivet. To the strap b the friction-pads c c are secured by the bolts c c. To the loop b one end of the strap d is secured. The strap is passed through the loop b2. The strap is provided with a series of holes d'. The end is passed through the eyebolt d2 and adjustably secured by the belt-hook d3 to the strap, as is clearly shown in Fig. 2. The eyebolt is provided with the two nuts d4 d4 and is adjustably secured to the spring-plate e, which is secured near the opposite end in the bracket e by the clamp-screw e2, the bracket being secured to the back strut a by the bolt e3.

The tension of the spring-plate eis adjusted by the four-sided block e4, provided with the handle e5. The block is secured to the back strut by the bolt e6, on which it may be turned, soas to bring either one of the four sides of the block to bear on the spring-plate, the four sides being each at a different distance from the center of the bolt e6, on which the block e4 turns. The spring tension of the springplate may be adjusted by turning the block c4.

When my improved Warp-let-off mechanism is in use on a loom, the spring-plate e draws the strap Z) and the friction-pads c c against the peripheral surface of the frictiondisk a4 and restrains the let-ofof the Warp. The strain of the Warp on the Warp-beam is resisted by the friction-strap. The opening of the warp-shed causes the warp-beam to partly turn in the direction of the arrowf and places the let-0d mechanism into the position shown in solid lines in Fig. 2, while in closing the shed the spring-plate eacts to take up the slack by partially turning the Warp- IOO beam in the reverse direction (indicated by the arrow f) and places the straps into the position indicated in broken lines in Fig. 2. By this construction and arrangement the strain on the warp delivered from the warpbeam is maintained uniform, because the spring-plate e when properly adjusted acts promptly at each formation of a Warp-shed, and the arrangement of the straps permits lthe rocking of the warp-beam.

Having thus described my invention, I claim as new and desire to secure by Letters Patent l. In a Warp-let-o mechanism, the combination with the Warp-beam and the frictiondisk connected with the same, of a frictionstrap inclosing the friction-disk, friction-pads on the same, loops on the ends ofthe frictionstrap, a spring-plate, and a strap, connected with one end of the friction-strap, extending through the loop on the other end of the fric tion-strap and connected with the spring, as described.

2. In a warp-let-off mechanism, the combination with the Warp-beam, the friction-disk connected with the same, a friction-strap,

friction-pads on the strap and loops on the ends of the friction-strap, of a spring-plate, a rotatable block eccentrically mounted having a multiple of facesnand connection be tween the spring-plate and the friction-strap,

whereby the strain on the friction-strap may be regulated, as described.

3. In a Warp-let-o mechanism, the combination with the friction-brake, of the bracket e' secured to the loom-frame and provided With the clamp-screw e2, the spring-plate e secured in the bracket e by the clamp-screw e2, the block e4 rotatably secured to the loomframe above the spring e the several faces of said block being at different distances from the pivotal point, the eyebolt secured to the spring e by the nuts d4 d4 and connection between the eyebolt and the friction-brake, as described.

4. In a let-oE mechanism for looms, the combination with the warp-beam and the friction-disk on the same, of the friction-strap b, the loops b and b2 on the ends of the same, the strap d, the eyebolt d3 adjustably secured to the spring-plate e, the spring-plate e, the rear strut ct', the bracket e on the same, and the rotatable multifaced block e4, whereby the strain on the friction-brake may be adjusted, as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

JAMES M. IECKI'IAM.

Witnesses:

J. A. MILLER, J r., ADA E. HAGERTY. 

